Estimate the Probability of the Event $0 =$ FOR, 1 = AGAINST

Multiple Choice

Estimate the probability of the event.
-A polling firm, hired to estimate the likelihood of the passage of an up-coming referendum, obtained the set of survey responses to make its estimate. The encoding system for the data is: $0 =$ FOR, 1 = AGAINST . If the referendum were held today, estimate the probability that it would pass.
$$0,1,1,0,0,1,0,1,1,0,0,0,1,0,1,0,0,0,1,0$$

A) 0.4
B) 0.5
C) 0.65
D) 0.6